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No. 626,73l'. Patented :une 13,1899.v

E. R. sTETTlNlus. Y

WATER TUBE BOILER.

(Application filed Nov. 7, 1898.)

(No Model.)

UNITED STATES.

PATENT OEEICE.

-EDIVARD R. STETTINIUS, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE STIRLING COMPANY, OF SAME PLACE.

WATER-'TU BE BOILER.

SPECIFICATION forming part of Letters Patent No. 626,731,6lated .Tune 13, 1899.

Application filed Nvember 7.1898. Serial No. 695,767; (No model.)

To all whom it may concern:

Be it known that I, EDWARD R. STETTINIUS, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Water-Tube Boilers, of which the following is a specification.

The object of my invention is to improve the Stirling boiler or water-tube boilers of the vertical type; and the invention consists in the features and combinations hereinafter described and claimed.

In the accompanying drawings, Figure l is a side elevation of my improved boiler, and Figs. 2 and 3 similar views showing modified forms of construction.

A are the lower mud-drums, and a pipes or nipples connecting the same; B, elevated steam-and-water drums, and b pipes connecting the steam spaces thereof; C, banks of tubes connecting the lower mud-drums with the elevated steam-and-water drums, and, in Figs. l and 2, D a pipe or pipes connecting the rear mud-drum with the middle elevated steam-and-water drum.

In constructing my improved boiler I use upper and lower drums, vertical or inclined banks of tubes, and various other parts in the general way or form in which they are commonly used in Stirling boilers or water-tube boilers of the vertical type; but in addition thereto I change the construction and em ploy other parts or features as follows:

In the form of boiler shown in Figs. l and 2 the feed-water is introduced into the rear elevated drum, from which it passes down into the rear lower mud-drum, thence up into the middle elevated drum, thence down into the front lower mud-drum, and thence up into the front elevated drum and back again into the lower mud-drum, all as required by the general circulation in the boiler. In 0rder that water may be fed from the rear lower mud-drum to the front lower mud-drum as required, I prefer to connect these drums by suitable nipples or pipes, as shown in Fig. l; but as this feeding forward of the water is not in all cases necessary these pipes or nipples may be omitted and the lower mud-drums entirely disconnected, as shown in Fig. 2. Two

banks of tubes connect the front elevated steameand-water drum with the front lower mud-drum, and a fire-brick wall or partition is placed between these banks, so as to require the heated gases or products of combustion to pass up, along, and among the tubes of the front bank before escaping over into the sec= ond bank. The result is that the front bank being the hottest part of the boiler water passes up through this bank from the front lower mud-drum to the front elevated steamand-water drum and thence down through the second bank, and so on in circuit. This provides for 'a powerful circulation in the front or hottest part of the boiler, and the connections farther back provide for a regular or constant feed to supply the place of water evaporated.

In the modification illustrated in Fig. 3 there are only two elevated drums and the pipe or pipes D are omitted. In this modification the feed-water is introduced through the rear upper drum, from which it passes down into the rear lower mud-drum, thence forward into the front lower mud-drum, up through the front bank of tubes intov the front elevated drum, down through the rear bank of tubes into the front mud-drum, and so on continuously.

I claiml. In a water-tube boiler, the combination of a rear elevated feed-drum, a rear lower mud-drum, a bank of tubes connecting the rear feed-drum with the rear mud-drum, a front elevated drum, a front lower mud-drum, two banks of tubes connecting the front elevated drum with the front lower mud-drum, a fire-brick wall or partition extending up from the front lower mud-drum between said 'two banks of tubes, and means for introducing water into the feed-drum and passing it down and forward to the hottest parts ofthe boiler, substantially as described.

2; In a water-tube boiler, the combination of three elevated drums, two lower muddrums, a bank of tubes connecting the rear elevated drum with the rear lower mud-drum, a pipe or pipes connecting the rear lower muddrum with themiddle elevated drum, a bank of tubes connecting the middle elevated drum IOO 'with the front lower mud-drum, two banks ofi ward to the hottest parts of the boiler, -su'btubes connecting the front lower mnd-drum stnntially as described. with the front'elevaited drum, a. fire-brick wail 1 g A o1 partition extending up from the front lower EDWARD R' STETTINIUS 5' mud-drum between said two banks of tubes, Witnesses:

andlneans for introducing water into the rear W. S. LUCAS, elevated drn'i and passing it down Aand for- L. XV. TUMAS.v 

